Attribute naming collisions and resolution

[lmolkova]

Adds check for naming conflicts:

1. Code generation (Code generation: how to avoid naming collisions semantic-conventions#1118)
   • fails when 2+ non-deprecated attributes would result in the same const name in code
   • allows to have a deprecated and non-deprecated attribute with the same const name
2. Namespace vs name collision (Add attribute naming checks semantic-conventions#1068)
   • fails when a non-deprecated attribute collides with a namespace of a non-deprecated attribute
   • allows collisions if one of them is deprecated